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    XQuery Functions

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    XQuery Functions

    XQuery 1.0, XPath 2.0, and XSLT 2.0 use one and the same library features.

    Different types of XQuery Functions are :

    • Accessor Functions
    • Error and Trace Functions
    • Numeric Functions
    • String Functions
    • AnyURI Functions
    • Boolean Functions
    • Duration/Date/Time Functions
    • QName Functions
    • Node Functions
    • Sequence Functions
    • Context Functions

    Functions are defined by fn: prefix. For example: fn: string). But fn: is the default namespace prefix, so when calling a feature you don't need to be prefix fn.

    Accessor Functions

    Sr No Name Description
    1. fn:node-name(node) This is used to return argument node-name.
    2. fn:nilled(node) It is used to return a Boolean value which indicates whether the argument node is nil.
    3. fn:data(item.item,...) A series of objects is taken and a set of atomic values released.
    4. fn:base-uri() fn:base-uri(node) It returns the value of current or defined node base-uri property.
    5. fn:document-uri(node) It returns the document-uri property value for the node you specify.

    Error and Trace Functions

    Sr No Name Description
    1. fn:error() fn:error(error) fn:error(error,description) fn:error(error,description,error-object) Example: error(fn:qname('http://example.com/test', 'err:toohigh'), 'error: price is too high')result: returns http://example.com/test#toohigh and the string "error: price is too high" to the external processing environment.
    2. fn:trace(value,label) it is used to debug queries.

    Numeric Values Functions

    Sr No Name Description
    1. fn:abs(num) It is used to returns the absolute value of the argument. For example: abs(2.05) Result: 2.05
    2. fn:abs(num) It is used to returns the absolute value of the argument For example: abs(2.05) Result: 2.05 Example: abs(-2.05) Result: 2.05
    3. fn:ceiling(num) It is used to returns the smallest integer that is greater than the number argument For example: ceiling(2.05) Result: 3
    4. fn:floor(num) It returns the largest integer that is not greater than the number argument For example: floor(2.05) Result: 2
    5. fn:round(num) It is used to round of the number argument to the nearest integer For example: round(2.05) Result: 2
    6. fn:round-half-to-even() Example: round-half-to-even(0.5) Result: 0 Example: round-half-to-even(1.5) Result: 2 Example: round-half-to-even(2.5) Result: 2

    String Functions

    There are a number of string functions used in XQuery but we use the chosen one here.

    A list of widely used XQuery string manipulation functions:

    Sr No Name Description
    1. string-length($string as xs:string) as xs:integer It is used to returns the length of the string.
    2. concat($input as xs:anyatomictype?) as xs:string It is used to returns the concatenated string as output.
    3. string-join($sequence as xs:string*, $delimiter as xs:string) as xs:string It is used to returns the combination of items in a sequence separated by a delimiter.

    Boolean Value Functions

    Sr No Name Description
    1. fn:boolean(arg) It is used to return a number, string, or node-set ,Boolean value.
    2. fn:not(arg) This specifies that, by implementing the function Boolean(),the statement is first reduced to a Boolean value. If the Boolean value is null, it returns true, and false if the Boolean value is valid. For example: not(true()) Result: false
    3. fn:true() It is used to returns the Boolean value true Example: true() Result: true
    4. fn:false() It is used to returns the Boolean value false For example: false() Result: false

    Time and Date Function

    XQuery supports a lot of time and date feature, but here we have the chosen one.

    XQuery includes a list of several widely used date and time functions:

    Sr No Name Description
    1. current-date() It is used to return the current date.
    2. current-time() It is used to return the current time.
    3. current-datetime() It is used to return both the current date and the current time.
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